Stinger by Robert R. McCammon

A UFO crash sends a small Texas town into uproar The sun rises on Inferno and Bordertown: patches of civilization carved out of the tough Texas earth, watching each other and waiting to see which dies first. The copper mine is finished, and both towns—one for the whites and one for the Mexicans—are wasting away. Now a pair of mysterious visitors is about to make them shrink faster. The black ball lands first. A small sphere, snapped off of an alien ship as it plummets through the atmosphere, it explodes onto Jessie Hammond’s truck. When Jessie’s daughter picks it up, the object possesses the young girl’s body and begins trying to communicate. As Jessie tries to rescue her daughter, something far more deadly sets down in the desert. An interstellar war has come to Texas, and Inferno is going to burn.